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You also wouldn't get the same I/O performance a stripped mirror will give you. You can get extra resiliency using a three disk mirror.

Disk is cheap. There's no reason to design like it's not.



Disk is at least ~$0.023/GB. Whether it's "cheap" or not depends on how much of it you need.

Plus, disk may be cheap but servers to house it are not (the kind of servers you'd run in your house, I know you can get cheap SC846 off eBay).


Servers can be inexpensive. It really depends on your use case. You don't have to drop 50K on a box to make a killer ZFS storage array.


My scale starts at 40PB with a "P". Disks aren't cheap.




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